I got this error when trying to build using a pre-built template from Xamarin:
Error CS0012: The type 'Task' is defined in an assembly that is not referenced
You must add a reference to assembly 'System.Threading.Tasks, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.
Where can I find the file to add these references?